This is a newly developed part/modification that has been approved by the ROC. The explanation below was reprinted from a February 3, 2022 SASS TG Wire post by Palewolf Brunelle. This is a commercial item available from a SASS-affiliat3ed merchant.
Explanation: Basic design previously approved (i.e., Sure Hit brass sight). Material (faux ivory) and color (white) comply with current SASS allowed sight modifications (REF: SHB p.34)